

 /*
 This file '_menu' is part of Firebird Integrated Solution 1.0

 Copyright (c) 2015 Lincong

 Contact:  
        Email: lincong1987@gmail.com

        QQ: 159257119
 
 See Usage at http://www.jplatformx.com/firebird

 Create date: 2015-07-14 04:45
 */


 (function ($, undefined) {

     var mouseHandled = false;

     $.widget("ui.menu", {
         version: "1.9.2",
         defaultElement: "<ul>",
         delay: 300,
         options: {
             icons: {
                 submenu: "ui-icon-carat-1-e"
             },
             menus: "ul",
             position: {
                 my: "left top",
                 at: "right top"
             },
             role: "menu",

             // callbacks
             blur: null,
             focus: null,
             select: null
         },

         _create: function () {
             this.activeMenu = this.element;
             this.element
                 .uniqueId()
                 .addClass("ui-menu ui-widget ui-widget-content ui-corner-all")
                 .toggleClass("ui-menu-icons", !!this.element.find(".ui-icon").length)
                 .attr({
                     role: this.options.role,
                     tabIndex: 0
                 })
                 // need to catch all clicks on disabled menu
                 // not possible through _on
                 .bind("click" + this.eventNamespace, $.proxy(function (event) {
                     if (this.options.disabled) {
                         event.preventDefault();
                     }
                 }, this));

             if (this.options.disabled) {
                 this.element
                     .addClass("ui-state-disabled")
                     .attr("aria-disabled", "true");
             }

             this._on({
                 // Prevent focus from sticking to links inside menu after clicking
                 // them (focus should always stay on UL during navigation).
                 "mousedown .ui-menu-item > a": function (event) {
                     event.preventDefault();
                 },
                 "click .ui-state-disabled > a": function (event) {
                     event.preventDefault();
                 },
                 "click .ui-menu-item:has(a)": function (event) {
                     var target = $(event.target).closest(".ui-menu-item");
                     if (!mouseHandled && target.not(".ui-state-disabled").length) {
                         mouseHandled = true;

                         this.select(event);
                         // Open submenu on click
                         if (target.has(".ui-menu").length) {
                             this.expand(event);
                         } else if (!this.element.is(":focus")) {
                             // Redirect focus to the menu
                             this.element.trigger("focus", [true]);

                             // If the active item is on the top level, let it stay active.
                             // Otherwise, blur the active item since it is no longer visible.
                             if (this.active && this.active.parents(".ui-menu").length === 1) {
                                 clearTimeout(this.timer);
                             }
                         }
                     }
                 },
                 "mouseenter .ui-menu-item": function (event) {
                     var target = $(event.currentTarget);
                     // Remove ui-state-active class from siblings of the newly focused menu item
                     // to avoid a jump caused by adjacent elements both having a class with a border
                     target.siblings().children(".ui-state-active").removeClass("ui-state-active");
                     this.focus(event, target);
                 },
                 mouseleave: "collapseAll",
                 "mouseleave .ui-menu": "collapseAll",
                 focus: function (event, keepActiveItem) {
                     // If there's already an active item, keep it active
                     // If not, activate the first item
                     var item = this.active || this.element.children(".ui-menu-item").eq(0);

                     if (!keepActiveItem) {
                         this.focus(event, item);
                     }
                 },
                 blur: function (event) {
                     this._delay(function () {
                         if (!$.contains(this.element[0], this.document[0].activeElement)) {
                             this.collapseAll(event);
                         }
                     });
                 },
                 keydown: "_keydown"
             });

             this.refresh();

             // Clicks outside of a menu collapse any open menus
             this._on(this.document, {
                 click: function (event) {
                     if (!$(event.target).closest(".ui-menu").length) {
                         this.collapseAll(event);
                     }

                     // Reset the mouseHandled flag
                     mouseHandled = false;
                 }
             });
         },

         _destroy: function () {
             // Destroy (sub)menus
             this.element
                 .removeAttr("aria-activedescendant")
                 .find(".ui-menu").andSelf()
                 .removeClass("ui-menu ui-widget ui-widget-content ui-corner-all ui-menu-icons")
                 .removeAttr("role")
                 .removeAttr("tabIndex")
                 .removeAttr("aria-labelledby")
                 .removeAttr("aria-expanded")
                 .removeAttr("aria-hidden")
                 .removeAttr("aria-disabled")
                 .removeUniqueId()
                 .show();

             // Destroy menu items
             this.element.find(".ui-menu-item")
                 .removeClass("ui-menu-item")
                 .removeAttr("role")
                 .removeAttr("aria-disabled")
                 .children("a")
                 .removeUniqueId()
                 .removeClass("ui-corner-all ui-state-hover")
                 .removeAttr("tabIndex")
                 .removeAttr("role")
                 .removeAttr("aria-haspopup")
                 .children().each(function () {
                     var elem = $(this);
                     if (elem.data("ui-menu-submenu-carat")) {
                         elem.remove();
                     }
                 });

             // Destroy menu dividers
             this.element.find(".ui-menu-divider").removeClass("ui-menu-divider ui-widget-content");
         },

         _keydown: function (event) {
             var match, prev, character, skip, regex,
                 preventDefault = true;

             function escape(value) {
                 return value.replace(/[\-\[\]{}()*+?.,\\\^$|#\s]/g, "\\$&");
             }

             switch (event.keyCode) {
                 case $.ui.keyCode.PAGE_UP:
                     this.previousPage(event);
                     break;
                 case $.ui.keyCode.PAGE_DOWN:
                     this.nextPage(event);
                     break;
                 case $.ui.keyCode.HOME:
                     this._move("first", "first", event);
                     break;
                 case $.ui.keyCode.END:
                     this._move("last", "last", event);
                     break;
                 case $.ui.keyCode.UP:
                     this.previous(event);
                     break;
                 case $.ui.keyCode.DOWN:
                     this.next(event);
                     break;
                 case $.ui.keyCode.LEFT:
                     this.collapse(event);
                     break;
                 case $.ui.keyCode.RIGHT:
                     if (this.active && !this.active.is(".ui-state-disabled")) {
                         this.expand(event);
                     }
                     break;
                 case $.ui.keyCode.ENTER:
                 case $.ui.keyCode.SPACE:
                     this._activate(event);
                     break;
                 case $.ui.keyCode.ESCAPE:
                     this.collapse(event);
                     break;
                 default:
                     preventDefault = false;
                     prev = this.previousFilter || "";
                     character = String.fromCharCode(event.keyCode);
                     skip = false;

                     clearTimeout(this.filterTimer);

                     if (character === prev) {
                         skip = true;
                     } else {
                         character = prev + character;
                     }

                     regex = new RegExp("^" + escape(character), "i");
                     match = this.activeMenu.children(".ui-menu-item").filter(function () {
                         return regex.test($(this).children("a").text());
                     });
                     match = skip && match.index(this.active.next()) !== -1 ?
                         this.active.nextAll(".ui-menu-item") :
                         match;

                     // If no matches on the current filter, reset to the last character pressed
                     // to move down the menu to the first item that starts with that character
                     if (!match.length) {
                         character = String.fromCharCode(event.keyCode);
                         regex = new RegExp("^" + escape(character), "i");
                         match = this.activeMenu.children(".ui-menu-item").filter(function () {
                             return regex.test($(this).children("a").text());
                         });
                     }

                     if (match.length) {
                         this.focus(event, match);
                         if (match.length > 1) {
                             this.previousFilter = character;
                             this.filterTimer = this._delay(function () {
                                 delete this.previousFilter;
                             }, 1000);
                         } else {
                             delete this.previousFilter;
                         }
                     } else {
                         delete this.previousFilter;
                     }
             }

             if (preventDefault) {
                 event.preventDefault();
             }
         },

         _activate: function (event) {
             if (!this.active.is(".ui-state-disabled")) {
                 if (this.active.children("a[aria-haspopup='true']").length) {
                     this.expand(event);
                 } else {
                     this.select(event);
                 }
             }
         },

         refresh: function () {
             var menus,
                 icon = this.options.icons.submenu,
                 submenus = this.element.find(this.options.menus);

             // Initialize nested menus
             submenus.filter(":not(.ui-menu)")
                 .addClass("ui-menu ui-widget ui-widget-content ui-corner-all")
                 .hide()
                 .attr({
                     role: this.options.role,
                     "aria-hidden": "true",
                     "aria-expanded": "false"
                 })
                 .each(function () {
                     var menu = $(this),
                         item = menu.prev("a"),
                         submenuCarat = $("<span>")
                             .addClass("ui-menu-icon ui-icon " + icon)
                             .data("ui-menu-submenu-carat", true);

                     item
                         .attr("aria-haspopup", "true")
                         .prepend(submenuCarat);
                     menu.attr("aria-labelledby", item.attr("id"));
                 });

             menus = submenus.add(this.element);

             // Don't refresh list items that are already adapted
             menus.children(":not(.ui-menu-item):has(a)")
                 .addClass("ui-menu-item")
                 .attr("role", "presentation")
                 .children("a")
                 .uniqueId()
                 .addClass("ui-corner-all")
                 .attr({
                     tabIndex: -1,
                     role: this._itemRole()
                 });

             // Initialize unlinked menu-items containing spaces and/or dashes only as dividers
             menus.children(":not(.ui-menu-item)").each(function () {
                 var item = $(this);
                 // hyphen, em dash, en dash
                 if (!/[^\-—–\s]/.test(item.text())) {
                     item.addClass("ui-widget-content ui-menu-divider");
                 }
             });

             // Add aria-disabled attribute to any disabled menu item
             menus.children(".ui-state-disabled").attr("aria-disabled", "true");

             // If the active item has been removed, blur the menu
             if (this.active && !$.contains(this.element[0], this.active[0])) {
                 this.blur();
             }
         },

         _itemRole: function () {
             return {
                 menu: "menuitem",
                 listbox: "option"
             }[this.options.role];
         },

         focus: function (event, item) {
             var nested, focused;
             this.blur(event, event && event.type === "focus");

             this._scrollIntoView(item);

             this.active = item.first();
             focused = this.active.children("a").addClass("ui-state-focus");
             // Only update aria-activedescendant if there's a role
             // otherwise we assume focus is managed elsewhere
             if (this.options.role) {
                 this.element.attr("aria-activedescendant", focused.attr("id"));
             }

             // Highlight active parent menu item, if any
             this.active
                 .parent()
                 .closest(".ui-menu-item")
                 .children("a:first")
                 .addClass("ui-state-active");

             if (event && event.type === "keydown") {
                 this._close();
             } else {
                 this.timer = this._delay(function () {
                     this._close();
                 }, this.delay);
             }

             nested = item.children(".ui-menu");
             if (nested.length && ( /^mouse/.test(event.type) )) {
                 this._startOpening(nested);
             }
             this.activeMenu = item.parent();

             this._trigger("focus", event, {item: item});
         },

         _scrollIntoView: function (item) {
             var borderTop, paddingTop, offset, scroll, elementHeight, itemHeight;
             if (this._hasScroll()) {
                 borderTop = parseFloat($.css(this.activeMenu[0], "borderTopWidth")) || 0;
                 paddingTop = parseFloat($.css(this.activeMenu[0], "paddingTop")) || 0;
                 offset = item.offset().top - this.activeMenu.offset().top - borderTop - paddingTop;
                 scroll = this.activeMenu.scrollTop();
                 elementHeight = this.activeMenu.height();
                 itemHeight = item.height();

                 if (offset < 0) {
                     this.activeMenu.scrollTop(scroll + offset);
                 } else if (offset + itemHeight > elementHeight) {
                     this.activeMenu.scrollTop(scroll + offset - elementHeight + itemHeight);
                 }
             }
         },

         blur: function (event, fromFocus) {
             if (!fromFocus) {
                 clearTimeout(this.timer);
             }

             if (!this.active) {
                 return;
             }

             this.active.children("a").removeClass("ui-state-focus");
             this.active = null;

             this._trigger("blur", event, {item: this.active});
         },

         _startOpening: function (submenu) {
             clearTimeout(this.timer);

             // Don't open if already open fixes a Firefox bug that caused a .5 pixel
             // shift in the submenu position when mousing over the carat icon
             if (submenu.attr("aria-hidden") !== "true") {
                 return;
             }

             this.timer = this._delay(function () {
                 this._close();
                 this._open(submenu);
             }, this.delay);
         },

         _open: function (submenu) {
             var position = $.extend({
                 of: this.active
             }, this.options.position);

             clearTimeout(this.timer);
             this.element.find(".ui-menu").not(submenu.parents(".ui-menu"))
                 .hide()
                 .attr("aria-hidden", "true");

             submenu
                 .show()
                 .removeAttr("aria-hidden")
                 .attr("aria-expanded", "true")
                 .position(position);
         },

         collapseAll: function (event, all) {
             clearTimeout(this.timer);
             this.timer = this._delay(function () {
                 // If we were passed an event, look for the submenu that contains the event
                 var currentMenu = all ? this.element :
                     $(event && event.target).closest(this.element.find(".ui-menu"));

                 // If we found no valid submenu ancestor, use the main menu to close all sub menus anyway
                 if (!currentMenu.length) {
                     currentMenu = this.element;
                 }

                 this._close(currentMenu);

                 this.blur(event);
                 this.activeMenu = currentMenu;
             }, this.delay);
         },

         // With no arguments, closes the currently active menu - if nothing is active
         // it closes all menus.  If passed an argument, it will search for menus BELOW
         _close: function (startMenu) {
             if (!startMenu) {
                 startMenu = this.active ? this.active.parent() : this.element;
             }

             startMenu
                 .find(".ui-menu")
                 .hide()
                 .attr("aria-hidden", "true")
                 .attr("aria-expanded", "false")
                 .end()
                 .find("a.ui-state-active")
                 .removeClass("ui-state-active");
         },

         collapse: function (event) {
             var newItem = this.active &&
                 this.active.parent().closest(".ui-menu-item", this.element);
             if (newItem && newItem.length) {
                 this._close();
                 this.focus(event, newItem);
             }
         },

         expand: function (event) {
             var newItem = this.active &&
                 this.active
                     .children(".ui-menu ")
                     .children(".ui-menu-item")
                     .first();

             if (newItem && newItem.length) {
                 this._open(newItem.parent());

                 // Delay so Firefox will not hide activedescendant change in expanding submenu from AT
                 this._delay(function () {
                     this.focus(event, newItem);
                 });
             }
         },

         next: function (event) {
             this._move("next", "first", event);
         },

         previous: function (event) {
             this._move("prev", "last", event);
         },

         isFirstItem: function () {
             return this.active && !this.active.prevAll(".ui-menu-item").length;
         },

         isLastItem: function () {
             return this.active && !this.active.nextAll(".ui-menu-item").length;
         },

         _move: function (direction, filter, event) {
             var next;
             if (this.active) {
                 if (direction === "first" || direction === "last") {
                     next = this.active
                         [direction === "first" ? "prevAll" : "nextAll"](".ui-menu-item")
                         .eq(-1);
                 } else {
                     next = this.active
                         [direction + "All"](".ui-menu-item")
                         .eq(0);
                 }
             }
             if (!next || !next.length || !this.active) {
                 next = this.activeMenu.children(".ui-menu-item")[filter]();
             }

             this.focus(event, next);
         },

         nextPage: function (event) {
             var item, base, height;

             if (!this.active) {
                 this.next(event);
                 return;
             }
             if (this.isLastItem()) {
                 return;
             }
             if (this._hasScroll()) {
                 base = this.active.offset().top;
                 height = this.element.height();
                 this.active.nextAll(".ui-menu-item").each(function () {
                     item = $(this);
                     return item.offset().top - base - height < 0;
                 });

                 this.focus(event, item);
             } else {
                 this.focus(event, this.activeMenu.children(".ui-menu-item")
                     [!this.active ? "first" : "last"]());
             }
         },

         previousPage: function (event) {
             var item, base, height;
             if (!this.active) {
                 this.next(event);
                 return;
             }
             if (this.isFirstItem()) {
                 return;
             }
             if (this._hasScroll()) {
                 base = this.active.offset().top;
                 height = this.element.height();
                 this.active.prevAll(".ui-menu-item").each(function () {
                     item = $(this);
                     return item.offset().top - base + height > 0;
                 });

                 this.focus(event, item);
             } else {
                 this.focus(event, this.activeMenu.children(".ui-menu-item").first());
             }
         },

         _hasScroll: function () {
             return this.element.outerHeight() < this.element.prop("scrollHeight");
         },

         select: function (event) {
             // TODO: It should never be possible to not have an active item at this
             // point, but the tests don't trigger mouseenter before click.
             this.active = this.active || $(event.target).closest(".ui-menu-item");
             var ui = {item: this.active};
             if (!this.active.has(".ui-menu").length) {
                 this.collapseAll(event, true);
             }
             this._trigger("select", event, ui);
         }
     });

 }(jQuery));